qmi_wwan: do not steal interfaces from class drivers

[ Upstream commit 5697db4a696c41601a1d15c1922150b4dbf5726c ]

The USB_DEVICE_INTERFACE_NUMBER matching macro assumes that
the { vendorid, productid, interfacenumber } set uniquely
identifies one specific function.  This has proven to fail
for some configurable devices. One example is the Quectel
EM06/EP06 where the same interface number can be either
QMI or MBIM, without the device ID changing either.

Fix by requiring the vendor-specific class for interface number
based matching.  Functions of other classes can and should use
class based matching instead.

Fixes: 03304bcb5ec4 ("net: qmi_wwan: use fixed interface number matching")
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 1029bd234c221eefd9379ef08be1809e9a80ff55..3e893fe890a0f3854b92f3ef3f05edcc6364db8c 100644 (file)
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -1039,6 +1039,18 @@ static int qmi_wwan_probe(struct usb_interface *intf,
                id->driver_info = (unsigned long)&qmi_wwan_info;
        }
 
+       /* There are devices where the same interface number can be
+        * configured as different functions. We should only bind to
+        * vendor specific functions when matching on interface number
+        */
+       if (id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER &&
+           desc->bInterfaceClass != USB_CLASS_VENDOR_SPEC) {
+               dev_dbg(&intf->dev,
+                       "Rejecting interface number match for class %02x\n",
+                       desc->bInterfaceClass);
+               return -ENODEV;
+       }
+
        /* Quectel EC20 quirk where we've QMI on interface 4 instead of 0 */
        if (quectel_ec20_detected(intf) && desc->bInterfaceNumber == 0) {
                dev_dbg(&intf->dev, "Quectel EC20 quirk, skipping interface 0\n");